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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
A difference in behavior (usually reproductive behavior) that prevents genetic exchange between members of different populations or species.
Industry:Natural environment
A layer of soft but solid, mobile rock comprising the lower part of the upper mantle from about 100 to 350 km beneath the Earth's surface.
Industry:Natural environment
A periodic wind caused by the effects of differential heating, with the largest being the Indian monsoon found in the Indian Ocean and southern Asia.
Industry:Natural environment
A small reproductive cell produced by certain bacteria, algae, fungi and nonflowering plants. Spores contain at least one genome and are highly resistant to heat excess and dehydration.
Industry:Natural environment
A tubelike structure in the body of a shelled cephalopod, such as the chambered nautilus, extending through the partitions of each chamber of the septate shell; the term is also used to describe tubular structures that direct water flow, or as a feeding siphon of several different kinds of invertebrates.
Industry:Natural environment
An embryonic cell that can give rise to any type of differentiated cell. They can be derived from two sources: the inner cell mass from a blastocyst or the primordial germ cells (eggs and sperm) of an older embryo.
Industry:Natural environment
Any small column-like structure in various plants and animals, often forming the central axis of development for the organism as a whole, or an anatomical structure; the thickened axial pillar around which the whorls of gastropods are constructed; the central axis of a corallite; the central structure of the calyx formed by fusion of the septa.
Industry:Natural environment
Energy traveling in the form of electromagnetic waves; energy emitted by the sun, typically in photons and waves .
Industry:Natural environment
In sponges, an endopinacocyte lining the excurrent canal.
Industry:Natural environment
Of or relating to photometry; a more precise measurement of the brightness (intensity) of light, which can be digitized and calibrated.
Industry:Natural environment
